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Improvement of the Performance Parameters of Precision Friction Couples in the Magnetic Field
Abstract
The paper considers the possibility to control the restoration and wear processes during friction depending on the location of magnetic poles using electromagnetic techniques. It is shown that both the steel piston and copper cylinder can be restored in the magnetic field separately (without disassembling the mechanism). A method is developed for restoring the friction surfaces in oil modified with different magnetic powders in a pulsed magnetic field. The influence of a pulsed magnetic field on the tribological characteristics of the friction couple in oil with different magnetic nanopowders is analyzed to reveal that the surfaces are the most functional in S/N pulsed magnetic field.
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Magnetic and magnetic-pulse hardening (MPH) of tools and machine parts is based on the fact that an eddy magnetic field acting on a metallic object improves its structure and properties. With this hardening technique the part is placed in the inductor with its center of gravity offset relative to the geometric center of the solenoid. As a result, when the installation is switched on the part is attracted by the field into the solenoid with an acceleration and makes decaying oscillations relative to the geometric center of the solenoid, the amplitude of which decreases with time as a result of friction, reaching zero as the part reaches its equilibrium position.
The effect of impulse treatment on structure of model alloys (low-carbon steel, technical iron), structural and tool steels is studied. Impulse effect is realized by shock waves with 200-1500 Hz frequency. Mechanical properties and microstructure of the samples before and after impulse treatment are determined. It is shown that impulse treatment increases steels strength, providing the viscosity is maintained or somewhat increased. The impulse treatment is shown to result in sufficient grain refinement. Under the given treatment microplastic deformation of materials is to take place.
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